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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cerrno> |
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28 #include <cstdio> |
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29 #include <cstdlib> |
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30 #include <cstring> |
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31 |
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32 #include <iostream> |
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33 |
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34 #ifdef HAVE_SYS_TYPES_H |
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35 #include <sys/types.h> |
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36 #endif |
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37 |
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38 #ifdef HAVE_UNISTD_H |
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39 #include <unistd.h> |
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40 #endif |
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41 |
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42 #include "file-ops.h" |
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43 #include "oct-env.h" |
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44 #include "oct-passwd.h" |
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45 #include "pathlen.h" |
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46 #include "statdefs.h" |
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47 #include "str-vec.h" |
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48 |
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49 #define NOT_SUPPORTED(nm) \ |
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50 nm ## ": not supported on this system" |
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51 |
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52 // We provide a replacement for mkdir(). |
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53 |
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54 int |
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55 file_ops::mkdir (const std::string& name, mode_t mode) |
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56 { |
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57 std::string msg; |
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58 return mkdir (name, mode, msg); |
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59 } |
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60 |
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61 int |
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62 file_ops::mkdir (const std::string& name, mode_t mode, std::string& msg) |
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63 { |
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64 msg = std::string (); |
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65 |
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66 int status = -1; |
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67 |
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68 #if defined (HAVE_MKDIR) |
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69 status = ::mkdir (name.c_str (), mode); |
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70 |
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71 if (status < 0) |
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72 { |
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73 using namespace std; |
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74 msg = ::strerror (errno); |
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75 } |
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76 #else |
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77 msg = NOT_SUPPORTED ("mkdir"); |
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78 #endif |
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79 |
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80 return status; |
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81 } |
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82 |
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83 // I don't know how to emulate this on systems that don't provide it. |
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84 |
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85 int |
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86 file_ops::mkfifo (const std::string& name, mode_t mode) |
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87 { |
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88 std::string msg; |
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89 return mkfifo (name, mode, msg); |
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90 } |
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91 |
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92 int |
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93 file_ops::mkfifo (const std::string& name, mode_t mode, std::string& msg) |
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94 { |
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95 msg = std::string (); |
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96 |
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97 int status = -1; |
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98 |
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99 #if defined (HAVE_MKFIFO) |
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100 status = ::mkfifo (name.c_str (), mode); |
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101 |
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102 if (status < 0) |
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103 { |
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104 using namespace std; |
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105 msg = ::strerror (errno); |
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106 } |
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107 #else |
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108 msg = NOT_SUPPORTED ("mkfifo"); |
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109 #endif |
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110 |
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111 return status; |
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112 } |
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113 |
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114 // I don't know how to emulate this on systems that don't provide it. |
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115 |
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116 int |
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117 file_ops::link (const std::string& old_name, const std::string& new_name) |
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118 { |
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119 std::string msg; |
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120 return link (old_name, new_name, msg); |
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121 } |
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122 |
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123 int |
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124 file_ops::link (const std::string& old_name, |
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125 const std::string& new_name, std::string& msg) |
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126 { |
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127 msg = std::string (); |
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128 |
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129 int status = -1; |
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130 |
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131 #if defined (HAVE_LINK) |
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132 status = ::link (old_name.c_str (), new_name.c_str ()); |
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133 |
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134 if (status < 0) |
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135 { |
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136 using namespace std; |
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137 msg = ::strerror (errno); |
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138 } |
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139 #else |
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140 msg = NOT_SUPPORTED ("link"); |
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141 #endif |
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142 |
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143 return status; |
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144 } |
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145 |
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146 // I don't know how to emulate this on systems that don't provide it. |
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147 |
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148 int |
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149 file_ops::symlink (const std::string& old_name, const std::string& new_name) |
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150 { |
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151 std::string msg; |
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152 return symlink (old_name, new_name, msg); |
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153 } |
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154 |
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155 int |
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156 file_ops::symlink (const std::string& old_name, |
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157 const std::string& new_name, std::string& msg) |
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158 { |
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159 msg = std::string (); |
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160 |
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161 int status = -1; |
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162 |
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163 #if defined (HAVE_SYMLINK) |
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164 status = ::symlink (old_name.c_str (), new_name.c_str ()); |
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165 |
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166 if (status < 0) |
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167 { |
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168 using namespace std; |
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169 msg = ::strerror (errno); |
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170 } |
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171 #else |
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172 msg = NOT_SUPPORTED ("symlink"); |
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173 #endif |
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174 |
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175 return status; |
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176 } |
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177 |
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178 // We provide a replacement for rename(). |
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179 |
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180 int |
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181 file_ops::readlink (const std::string& path, std::string& result) |
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182 { |
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183 std::string msg; |
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184 return readlink (path, result, msg); |
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185 } |
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186 |
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187 int |
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188 file_ops::readlink (const std::string& path, std::string& result, |
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189 std::string& msg) |
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190 { |
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191 int status = -1; |
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192 |
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193 msg = std::string (); |
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194 |
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195 char buf[MAXPATHLEN+1]; |
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196 |
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197 #if defined (HAVE_READLINK) |
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198 status = ::readlink (path.c_str (), buf, MAXPATHLEN); |
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199 |
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200 if (status < 0) |
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201 { |
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202 using namespace std; |
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203 msg = ::strerror (errno); |
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204 } |
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205 else |
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206 { |
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207 buf[status] = '\0'; |
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208 result = string (buf); |
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209 status = 0; |
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210 } |
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211 #else |
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212 msg = NOT_SUPPORTED ("rename"); |
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213 #endif |
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214 |
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215 return status; |
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216 } |
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217 |
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218 // We provide a replacement for rename(). |
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219 |
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220 int |
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221 file_ops::rename (const std::string& from, const std::string& to) |
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222 { |
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223 std::string msg; |
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224 return rename (from, to, msg); |
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225 } |
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226 |
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227 int |
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228 file_ops::rename (const std::string& from, const std::string& to, |
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229 std::string& msg) |
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230 { |
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231 int status = -1; |
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232 |
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233 msg = std::string (); |
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234 |
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235 #if defined (HAVE_RENAME) |
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236 status = ::rename (from.c_str (), to.c_str ()); |
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237 |
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238 if (status < 0) |
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239 { |
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240 using namespace std; |
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241 msg = ::strerror (errno); |
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242 } |
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243 #else |
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244 msg = NOT_SUPPORTED ("rename"); |
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245 #endif |
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246 |
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247 return status; |
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248 } |
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249 |
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250 // We provide a replacement for rmdir(). |
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251 |
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252 int |
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253 file_ops::rmdir (const std::string& name) |
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254 { |
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255 std::string msg; |
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256 return rmdir (name, msg); |
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257 } |
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258 |
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259 int |
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260 file_ops::rmdir (const std::string& name, std::string& msg) |
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261 { |
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262 msg = std::string (); |
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263 |
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264 int status = -1; |
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265 |
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266 #if defined (HAVE_RMDIR) |
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267 status = ::rmdir (name.c_str ()); |
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268 |
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269 if (status < 0) |
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270 { |
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271 using namespace std; |
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272 msg = ::strerror (errno); |
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273 } |
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274 #else |
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275 msg = NOT_SUPPORTED ("rmdir"); |
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276 #endif |
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277 |
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278 return status; |
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279 } |
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280 |
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281 // We provide a replacement for tempnam(). |
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282 |
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283 std::string |
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284 file_ops::tempnam (const std::string& dir, const std::string& pfx) |
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285 { |
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286 std::string msg; |
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287 return tempnam (dir, pfx, msg); |
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288 } |
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289 |
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290 std::string |
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291 file_ops::tempnam (const std::string& dir, const std::string& pfx, |
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292 std::string& msg) |
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293 { |
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294 msg = std::string (); |
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295 |
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296 std::string retval; |
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297 |
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298 const char *pdir = dir.empty () ? 0 : dir.c_str (); |
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299 |
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300 const char *ppfx = pfx.empty () ? 0 : pfx.c_str (); |
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301 |
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302 char *tmp = ::tempnam (pdir, ppfx); |
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303 |
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304 if (tmp) |
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305 { |
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306 retval = tmp; |
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307 |
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308 ::free (tmp); |
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309 } |
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310 else |
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311 { |
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312 using namespace std; |
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313 msg = ::strerror (errno); |
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314 } |
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315 |
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316 return retval; |
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317 } |
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318 |
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319 // The following tilde-expansion code was stolen and adapted from |
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320 // readline. |
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321 |
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322 // XXX FIXME XXX |
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323 #define DIR_SEP_CHAR '/' |
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324 |
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325 // The default value of tilde_additional_prefixes. This is set to |
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326 // whitespace preceding a tilde so that simple programs which do not |
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327 // perform any word separation get desired behaviour. |
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328 static const char *default_prefixes[] = { " ~", "\t~", ":~", 0 }; |
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329 |
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330 // The default value of tilde_additional_suffixes. This is set to |
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331 // whitespace or newline so that simple programs which do not perform |
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332 // any word separation get desired behaviour. |
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333 static const char *default_suffixes[] = { " ", "\n", ":", 0 }; |
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334 |
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335 // If non-null, this contains the address of a function that the |
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336 // application wants called before trying the standard tilde |
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337 // expansions. The function is called with the text sans tilde, and |
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338 // returns a malloc()'ed string which is the expansion, or a NULL |
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339 // pointer if the expansion fails. |
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340 file_ops::tilde_expansion_hook file_ops::tilde_expansion_preexpansion_hook = 0; |
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341 |
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342 // If non-null, this contains the address of a function to call if the |
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343 // standard meaning for expanding a tilde fails. The function is |
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344 // called with the text (sans tilde, as in "foo"), and returns a |
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345 // malloc()'ed string which is the expansion, or a NULL pointer if |
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346 // there is no expansion. |
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347 file_ops::tilde_expansion_hook file_ops::tilde_expansion_failure_hook = 0; |
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348 |
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349 // When non-null, this is a NULL terminated array of strings which are |
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350 // duplicates for a tilde prefix. Bash uses this to expand `=~' and |
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351 // `:~'. |
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352 string_vector file_ops::tilde_additional_prefixes = default_prefixes; |
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353 |
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354 // When non-null, this is a NULL terminated array of strings which |
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355 // match the end of a username, instead of just "/". Bash sets this |
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356 // to `:' and `=~'. |
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357 string_vector file_ops::tilde_additional_suffixes = default_suffixes; |
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358 |
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359 // Find the start of a tilde expansion in S, and return the index |
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360 // of the tilde which starts the expansion. Place the length of the |
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361 // text which identified this tilde starter in LEN, excluding the |
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362 // tilde itself. |
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363 |
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364 static size_t |
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365 tilde_find_prefix (const std::string& s, size_t& len) |
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366 { |
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367 len = 0; |
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368 |
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369 size_t s_len = s.length (); |
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370 |
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371 if (s_len == 0 || s[0] == '~') |
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372 return 0; |
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373 |
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374 string_vector prefixes = file_ops::tilde_additional_prefixes; |
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375 |
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376 if (! prefixes.empty ()) |
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377 { |
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378 for (size_t i = 0; i < s_len; i++) |
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379 { |
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380 for (int j = 0; j < prefixes.length (); j++) |
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381 { |
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382 size_t pfx_len = prefixes[j].length (); |
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383 |
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384 if (prefixes[j].compare (s.substr (i, pfx_len)) == 0) |
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385 { |
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386 len = pfx_len - 1; |
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387 return i + len; |
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388 } |
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389 } |
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390 } |
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391 } |
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392 |
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393 return s_len; |
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394 } |
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395 |
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396 // Find the end of a tilde expansion in S, and return the index |
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397 // of the character which ends the tilde definition. |
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398 |
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399 static size_t |
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400 tilde_find_suffix (const std::string& s) |
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401 { |
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402 size_t s_len = s.length (); |
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403 |
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404 string_vector suffixes = file_ops::tilde_additional_suffixes; |
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405 |
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406 size_t i = 0; |
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407 |
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408 for ( ; i < s_len; i++) |
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409 { |
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410 if (s[i] == DIR_SEP_CHAR) |
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411 break; |
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412 |
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413 if (! suffixes.empty ()) |
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414 { |
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415 for (int j = 0; j < suffixes.length (); j++) |
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416 { |
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417 size_t sfx_len = suffixes[j].length (); |
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418 |
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419 if (suffixes[j].compare (s.substr (i, sfx_len)) == 0) |
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420 return i; |
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421 } |
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422 } |
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423 } |
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424 |
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425 return i; |
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426 } |
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427 |
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428 // Take FNAME and return the tilde prefix we want expanded. |
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429 |
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430 static std::string |
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431 isolate_tilde_prefix (const std::string& fname) |
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432 { |
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433 size_t f_len = fname.length (); |
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434 |
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435 size_t len = 1; |
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436 |
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437 while (len < f_len && fname[len] != DIR_SEP_CHAR) |
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438 len++; |
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439 |
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440 return fname.substr (1, len); |
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441 } |
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442 |
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443 // Do the work of tilde expansion on FILENAME. FILENAME starts with a |
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444 // tilde. |
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445 |
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446 static std::string |
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447 tilde_expand_word (const std::string& filename) |
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448 { |
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449 size_t f_len = filename.length (); |
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450 |
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451 if (f_len == 0 || filename[0] != '~') |
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452 return filename; |
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453 |
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454 // A leading `~/' or a bare `~' is *always* translated to the value |
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455 // of $HOME or the home directory of the current user, regardless of |
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456 // any preexpansion hook. |
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457 |
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458 if (f_len == 1 || filename[1] == DIR_SEP_CHAR) |
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459 return octave_env::get_home_directory () + filename.substr (1); |
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460 |
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461 std::string username = isolate_tilde_prefix (filename); |
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462 |
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463 size_t user_len = username.length (); |
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464 |
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3504
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465 std::string dirname; |
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466 |
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467 if (file_ops::tilde_expansion_preexpansion_hook) |
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468 { |
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3504
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469 std::string expansion |
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470 = file_ops::tilde_expansion_preexpansion_hook (username); |
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471 |
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472 if (! expansion.empty ()) |
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473 return expansion + filename.substr (user_len+1); |
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3040
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474 } |
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475 |
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476 // No preexpansion hook, or the preexpansion hook failed. Look in the |
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477 // password database. |
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478 |
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479 octave_passwd pw = octave_passwd::getpwnam (username); |
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480 |
|
|
481 if (! pw) |
|
|
482 { |
|
|
483 // If the calling program has a special syntax for expanding tildes, |
|
|
484 // and we couldn't find a standard expansion, then let them try. |
|
|
485 |
|
|
486 if (file_ops::tilde_expansion_failure_hook) |
|
|
487 { |
|
3504
|
488 std::string expansion |
|
3040
|
489 = file_ops::tilde_expansion_failure_hook (username); |
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|
490 |
|
|
491 if (! expansion.empty ()) |
|
3074
|
492 dirname = expansion + filename.substr (user_len+1); |
|
3040
|
493 } |
|
|
494 |
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|
495 // If we don't have a failure hook, or if the failure hook did not |
|
|
496 // expand the tilde, return a copy of what we were passed. |
|
|
497 |
|
|
498 if (dirname.length () == 0) |
|
|
499 dirname = filename; |
|
|
500 } |
|
|
501 else |
|
3074
|
502 dirname = pw.dir () + filename.substr (user_len+1); |
|
3040
|
503 |
|
|
504 return dirname; |
|
|
505 } |
|
|
506 |
|
|
507 // If NAME has a leading ~ or ~user, Unix-style, expand it to the |
|
|
508 // user's home directory. If no ~, or no <pwd.h>, just return NAME. |
|
|
509 |
|
3504
|
510 std::string |
|
|
511 file_ops::tilde_expand (const std::string& name) |
|
2926
|
512 { |
|
3504
|
513 std::string result; |
|
2926
|
514 |
|
3040
|
515 size_t name_len = name.length (); |
|
2926
|
516 |
|
3040
|
517 // Scan through S expanding tildes as we come to them. |
|
2926
|
518 |
|
3040
|
519 size_t pos = 0; |
|
2926
|
520 |
|
3040
|
521 while (1) |
|
|
522 { |
|
|
523 if (pos > name_len) |
|
|
524 break; |
|
2926
|
525 |
|
3040
|
526 size_t len; |
|
|
527 |
|
|
528 // Make START point to the tilde which starts the expansion. |
|
2926
|
529 |
|
3040
|
530 size_t start = tilde_find_prefix (name.substr (pos), len); |
|
|
531 |
|
|
532 result.append (name.substr (pos, start)); |
|
2926
|
533 |
|
3040
|
534 // Advance STRING to the starting tilde. |
|
|
535 |
|
|
536 pos += start; |
|
2926
|
537 |
|
3040
|
538 // Make FINI be the index of one after the last character of the |
|
|
539 // username. |
|
2926
|
540 |
|
3040
|
541 size_t fini = tilde_find_suffix (name.substr (pos)); |
|
2926
|
542 |
|
3040
|
543 // If both START and FINI are zero, we are all done. |
|
2926
|
544 |
|
3040
|
545 if (! (start || fini)) |
|
|
546 break; |
|
2926
|
547 |
|
3040
|
548 // Expand the entire tilde word, and copy it into RESULT. |
|
2947
|
549 |
|
3504
|
550 std::string tilde_word = name.substr (pos, fini); |
|
3040
|
551 |
|
|
552 pos += fini; |
|
2926
|
553 |
|
3504
|
554 std::string expansion = tilde_expand_word (tilde_word); |
|
3040
|
555 |
|
|
556 result.append (expansion); |
|
2926
|
557 } |
|
|
558 |
|
3040
|
559 return result; |
|
2926
|
560 } |
|
|
561 |
|
|
562 // A vector version of the above. |
|
|
563 |
|
|
564 string_vector |
|
|
565 file_ops::tilde_expand (const string_vector& names) |
|
|
566 { |
|
|
567 string_vector retval; |
|
|
568 |
|
|
569 int n = names.length (); |
|
|
570 |
|
|
571 retval.resize (n); |
|
|
572 |
|
|
573 for (int i = 0; i < n; i++) |
|
|
574 retval[i] = file_ops::tilde_expand (names[i]); |
|
|
575 |
|
|
576 return retval; |
|
|
577 } |
|
1802
|
578 |
|
1765
|
579 int |
|
2926
|
580 file_ops::umask (mode_t mode) |
|
1765
|
581 { |
|
|
582 #if defined (HAVE_UMASK) |
|
2926
|
583 return ::umask (mode); |
|
1765
|
584 #else |
|
|
585 return 0; |
|
|
586 #endif |
|
|
587 } |
|
|
588 |
|
1773
|
589 int |
|
3504
|
590 file_ops::unlink (const std::string& name) |
|
1773
|
591 { |
|
3504
|
592 std::string msg; |
|
2937
|
593 return unlink (name, msg); |
|
1773
|
594 } |
|
|
595 |
|
2668
|
596 int |
|
3504
|
597 file_ops::unlink (const std::string& name, std::string& msg) |
|
2668
|
598 { |
|
3504
|
599 msg = std::string (); |
|
2668
|
600 |
|
2937
|
601 int status = -1; |
|
|
602 |
|
|
603 #if defined (HAVE_UNLINK) |
|
|
604 status = ::unlink (name.c_str ()); |
|
2668
|
605 |
|
|
606 if (status < 0) |
|
3504
|
607 { |
|
|
608 using namespace std; |
|
|
609 msg = ::strerror (errno); |
|
|
610 } |
|
2937
|
611 #else |
|
|
612 msg = NOT_SUPPORTED ("unlink"); |
|
|
613 #endif |
|
2668
|
614 |
|
|
615 return status; |
|
|
616 } |
|
|
617 |
|
1765
|
618 /* |
|
|
619 ;;; Local Variables: *** |
|
|
620 ;;; mode: C++ *** |
|
|
621 ;;; End: *** |
|
|
622 */ |
